<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hello World</title>
    <script type="text/javascript">
         alert("Hello World");//网页弹窗；
        document.write("hello world");//网页打印；
        console.log("你好");//向控制台输出内容；
    </script>
    <script text="test/javascript">

    </script>
</head>
<body>
    
</body>
</html>